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采用高输入频率(IF)的高速模拟一数字变换器(ADC)的系统,其设计一直被证明是一项具有挑战性的任务。而变压器的采用则使得这一任务变得更为困难,因为变压器存在固有的非线性,这些非线性特性会造成性能难以达到标准。本文就高速分级比较(sub-ranging)ADC采用变压器耦合前端设计时应该注意的问题进行了分类说明。
The design of systems using high-speed analog-to-digital converters (ADCs) with high input frequencies (IFs) has proven to be a challenging task. The use of transformers makes this task even more difficult because transformers have inherent non-linearities that can make performance difficult to meet. This article classifies the problems that high-speed sub-ranging ADCs should pay attention to when using transformer-coupled front-end designs.